My diagnostic was a 144 the through poor study habits took the Januray test and got a 146. Been four months since then and my most recent PT was a 164. So your situation is totally doable, the hardest part is finding study and learning system that fits your learning style. For me it was weekly tutoring, short daily drills on weak topics, and one untimed RC passage per day. Weekly timed tests broken into sections taken over two days was helpful too, less burnout by taking a full test all at once and makes review lots more managable, especially when your scoring -10 or more per section.

Also breaking through the 150's is so challenging, but after that gets easier. In the 150's I remeber the questions sounding like greek to me and just having no clue how anyone could track the reasoning, that goes away and understanding becomes more habitual with practice.

I just took April administration and it felt pretty good, hoping for a better score than my PT's and excited for the June test aswell. Long story short- you got this, dont loose hope, focus on learning and detach from score. You got this.